一种高增益DC-DC变换器实验分析

Experimental Analysis of a High Gain DC-DC Converter

针对传统Boost升压电路受到电路元件寄生参数的影响无法实现高升压比的问题,提出了一种基于三绕组双倍压单元的新型高增益直流变换器。变换器利用二极管、电容和耦合电感构成的双倍压单元扩大电压增益,并利用无源无损吸收电路来吸收漏感能量,抑制漏感带来的尖峰电压。通过对新型变换器工作的各个模态进行详细分析,推导了电压增益及元器件电压电流应力;实验表明该新型变换器能够有效提高电压增益、降低功率开关管的电压应力。

Aiming at the problem that the traditional Boost circuit cannot achieve high boost ratio due to the parasitic parameters of circuit components,a new high gain DC-DC converter based on three-winding two voltagedoubler unit was proposed.The voltage gain of the converter was expanded by using two voltage-doubler cells which composed of diode,capacitor,and coupled inductor.The passive lossless snubber circuit was used to absorb the leakage inductance energy and suppress the peak voltage caused by the leakage inductance.Through detailed analysis for the various operation modes of the new converter,the voltage gain,component voltage and current stress were derived.Experiments show that the new converter can effectively increase the voltage gain while reducing the voltage stress of the power switch tube.